I do a lot of genealogy, and am interested in it from all over the world. Mainly names from other countries and titles of royalty of other contries. Even though I thought it had to do with titles of royalty from the middle east, I couldn't find a connection concerning Royalty.
But on the internet, using the name KANWAR, their are listings for the last name KANWAR.
The name is in India. Amoung them is a professor. A film director in the provence of Punjab.
So I would say that any chance of finding an answer would be in that area of the world.